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gpu: nvgpu: BUG_ON for sema increment, not value

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When adding a sema wait to a pushbuf, verify that the sema threshold has
been incremented from the original value by reading the incremented
field instead of value (which is set to nonzero by
nvgpu_semaphore_incr()). Value could be 0 even after an increment if new
semas weren't reset to 0.

Jira NVGPU-514

Change-Id: I295451fbc7eb9e597aea12d73074e99f74a6a899
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1658100
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Konsta Holtta
2018-02-14 18:12:47 +02:00
committed by mobile promotions
parent ca95adb2d4
commit b063870f90
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c
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@@ -625,7 +625,7 @@ static int __semaphore_wait_fd_fast_path(struct channel_gk20a *c,
return err;
nvgpu_semaphore_get(sema);
BUG_ON(!nvgpu_atomic_read(&sema->value));
BUG_ON(!sema->incremented);
add_sema_cmd(c->g, c, sema, wait_cmd, 8, true, false);
/*